Manipal MET2023PhysicsMechanical Properties of Fluids
The lower end of a capillary tube is dipped into water and it is seen that water rises through 7.5 cm in the capillary. Given, surface tension of water is 7.5 10⁻² Nm ⁻¹ and angle of contact between water and glass capillary tube is zero. What will be the diameter (in mm ) of the capillary tube? (given, g=10 ~ms ⁻² )
Correct answer
0.4
Step-by-step solution
Given, h=7.5 ~cm =7.5 10⁻² ~m aligned & S=7.5 10⁻² Nm ⁻¹ & = ^ , r=? aligned As, h= 2 S r g 2 r= 4 S h g = 4 7.5 10⁻² 0^ 7.5 10⁻² 10^3 10 =4 10⁻⁴=0.4 ~mm